A Digital Multibeam Array With Wide Scanning Angle and Enhanced Beam Gain for Millimeter-Wave Massive MIMO Applications

Hu, Yun; Wang, Hong; Yu, Chao; Yu, Yingrui; Zhang, Hui; Yu, Zhiqiang; Zhang, Nianzu

doi:10.1109/tap.2018.2869200

Cited by 63 publications

(17 citation statements)

References 24 publications

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“…Modern plastics exhibit low mmWave losses, are homogeneous, and do not readily age or absorb moisture [29]. The radiation performance of the constantr lens is comparable to planar array configurations like the ones presented in [6], [30]- [31], with comparatively marginal deployment complexity.…”

Section: Lens Based Beamformersmentioning

confidence: 99%

Constant-${\epsilon}_{r}$ Lens Beamformer for Low-Complexity Millimeter-Wave Hybrid MIMO

Abbasi

Fusco

Tataria

et al. 2019

IEEE Trans. Microwave Theory Techn.

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It is well established that the utilization of unused millimeter-wave (mmWave) spectrum is inevitable due to unavailability of required bandwidth in the conventional RF band to support the high data demands of 5G. Large antenna arrays with beamforming capabilities are required to compensate for the high path-loss at mmWave frequencies. We are at the verge of a massive mmWave radio front-end deployment and low-complexity low-cost hardware beamforming solutions are required now at this stage than ever before. In this work, one such solution is demonstrated and analyzed. A high performance and low-complexity lens based beamformer consisting of constant dielectric material (r) with antenna-feeds is presented for multibeams operation. A prototype is developed based on the classical synthesis approach, and in line with the requirements of mmWave hybrid multiuser multiple-input multiple-output (MU-MIMO) systems. A characterization at 28 GHz is performed wherein uplink signal-to-noise-ratio of user terminals is evaluated with the zero-forcing (ZF) baseband signal processing. Radiation performance of a single source beamformer is measured in an anechoic environment and end-to-end ergodic sum spectral efficiency performance is estimated based on the measured data. It is shown that the constantr based beamformer solution is simple, yet significantly outperforms conventional antenna array beamformers with analog phase shifter network, making it a promising candidate for future hybrid massive MIMO systems.

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Section: Lens Based Beamformersmentioning

confidence: 99%

Constant-${\epsilon}_{r}$ Lens Beamformer for Low-Complexity Millimeter-Wave Hybrid MIMO

Abbasi

Fusco

Tataria

et al. 2019

IEEE Trans. Microwave Theory Techn.

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“…Both fully digital and analog-digital (a.k.a. hybrid) beamforming structures have been proposed at mmWaves, and their implementation aspects have been the topic of long standing debates in the literature [9], [10]. The main motivation behind the hybrid beamforming architecture is to reduce the net energy consumption of mixed signal components by lowering the number of active RF chains with the use of explicit beamforming.…”

Section: Introductionmentioning

confidence: 99%

“…While this improves the energy efficiency of mmWave systems, the spectral efficiency performance is lower than the fully digital case due to the loss in the effective degrees-of-freedom. On the other hand, fully digital architectures with implicit beamforming also show promise and have been practically realized in [9], [10] at 28 GHz for BS arrays up to 64 antennas. Despite this, for both architecture types, majority of the proposed designs focus on optimizing the ergodic spectral efficiency of the system with fixed BS and UEs using the drop-based models (see e.g., [1], [9]- [12]).…”

Section: Introductionmentioning

confidence: 99%

Impact of Spatially Consistent Channels on Digital Beamforming for Millimeter-Wave Systems : (Invited Paper)

Tataria

Tufvesson

2020

2020 14th European Conference on Antennas and Propagation (EuCAP)

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The premise of massive multiple-input multipleoutput (MIMO) is based around coherent transmission and detection. Majority of the vast literature on massive MIMO presents performance evaluations over simplified statistical propagation models. All such models are drop-based and do not ensure continuity of channel parameters. In this paper, we quantify the impact of spatially consistent (SC) models on beamforming for massive MIMO systems. We focus on the downlink of a 28 GHz multiuser urban microcellular scenario. Using the recently standardized Third Generation Partnership Project 38.901 SC-I procedure, we evaluate the signal-to-interference-plus-noise ratio of a user equipment and the system ergodic sum spectral efficiency with zero-forcing, block diagonalization, and signalto-leakage-plus-noise ratio beamforming. Across different user movement trajectories, our results disclose that SC channels yield a significant performance loss relative to the case without SC due to substantial spatial correlation across the channel parameters.

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“…Beam switchable antenna has been widely concerned and studied due to its ability of directional radiation and beam tracking, which can expand the coverage of wireless signals while obtaining high gain. The existing beam-switchable antennas can be approximately summed up in four categories: (a) phased array antennas [1][2][3][4][5] ; (b) liquid metal antennas [6][7][8] ; (c) beam-switchable antennas based on AFSS (active frequency selective surface) [9][10][11][12][13] ; (d) parasitic antennas, such as pixel antennas [14][15][16] and electronically controlled quasi-Yagi array (ECQYA) antennas. [17][18][19][20][21][22] Although all the above methods can achieve beam steering, the ECQYA antennas have the advantages of low cost, pattern agility, and simple structure.…”

Section: Introductionmentioning

confidence: 99%

Reconfigurable dipole antenna array with shared parasitic elements for 360° beam steering

Chang

Chu

2020

Int J RF Microw Comput Aided Eng

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Different from the traditional reconfigurable antennas, in which PIN diodes are just used as switches, a novel method for achieving the reactance tuning is proposed, in which the impedance characteristics of the PIN diode in different working states are used to realize elements sharing. The mechanism of element sharing is explained by mathematical analysis, firstly. Then, the novel method of realizing element sharing based on the impedance characteristics of PIN diode is explained. By this way, reactance tuning can be easily achieved using PIN diode. Finally, a 360 beam switchable dipole antenna array is designed to illustrate the feasibility of the proposed method. The results show that gains of 7.8 dBi, and FBRs (front-to-back ratios) of greater than 19 dB are achieved by the proposed antenna. In particular, the maximum gain drop of the proposed antenna is less than 0.72 dB when switching between different working modes.

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A Digital Multibeam Array With Wide Scanning Angle and Enhanced Beam Gain for Millimeter-Wave Massive MIMO Applications

Cited by 63 publications

References 24 publications

Constant-${\epsilon}_{r}$ Lens Beamformer for Low-Complexity Millimeter-Wave Hybrid MIMO

Constant-${\epsilon}_{r}$ Lens Beamformer for Low-Complexity Millimeter-Wave Hybrid MIMO

Impact of Spatially Consistent Channels on Digital Beamforming for Millimeter-Wave Systems : (Invited Paper)

Reconfigurable dipole antenna array with shared parasitic elements for 360° beam steering

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